Preparation of Cu2(OH)3NO3/ZnO, a novel catalyst for methyl orange oxidation under ambient conditions

Authors:  Assadawoot Srikhaow, Siwaporn Meejoo Smith

Abstract:
This work reports a novel process to synthesize copper hydroxyl nitrate/zinc oxide composites (Cu₂(OH)₃NO₃/ZnO), and their application as a highly effective and reusable catalyst for wet oxidation of methyl orange (MO) under ambient conditions. No additional air or oxygen flow is required. Using a metal oxide assisted method, the Cu₂(OH)₃NO₃/ZnO composites were hydrothermally obtained by varying the Cu:Zn mole ratio (2:1, 4:1, and 6:1) and the structural, chemical and surface properties of the composites were investigated. Decolorization of 500 ppm MO can be effectively catalyzed by the Cu₂(OH)₃NO₃/ZnO composite (Cu:Zn = 4:1) with the color, chemical oxygen demand (COD) and total organic carbon (TOC) removal efficiencies being greater than 99%, 98% and 94%, respectively, after 20 min treatments using the catalyst loading of 3 g L−1. Results from systematic catalytic activity tests strongly suggested that MO was oxidized by oxygen dissolved in the dye solution, and that the degradation pathway of MO possibly occurred through radical and H₂O₂ generation. The application of highly efficient Cu₂(OH)₃NO₃/ZnO catalysts in wastewater remediation may be attractive alternative to existing oxidation catalyst systems as they are low-cost, simple to prepare, feasible to operate under ambient conditions. 

Keywords:
Copper hydroxide nitrate
Zinc oxide
Layered hydroxyl salts
Catalytic wet oxidation
Wastewater treatment

Published in: Applied Catalysis B: Environmental (Volumes 130–131, Pages 1-336, 7 February 2013)

Publisher: Elsevier  

ISSN Information: 0926-3373

Preparation of Cu2(OH)3NO3/ZnO, a novel catalyst for methyl orange oxidation under ambient conditions

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